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Javascript method to achieve the effect of colorful snowflakes falling from the sky

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PHPzOriginal
2016-05-16 16:16:191283browse

This article mainly introduces the Javascript method to achieve the effect of colorful snowflakes falling from the sky. It can achieve the effect of snowflakes falling and scattering. It is very dazzling and gorgeous. Friends in need can refer to it. The specific analysis is as follows:

Let’s take a look at the running effect first, as shown in the figure below:

The complete source code is as follows: 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Javascript多彩雪花从天降</title>
<style type="text/css">
.jb51Snow{display:block; overflow:hidden; font-size:12px; position:absolute};
body{background:#000;margin:0px}
html{overflow:hidden; background:#000;}
a{color:White;text-decoration:none}
.jb51Title{color:red;height:140px;width:800px;margin:0px auto;text-align:center}
</style>
</head>
<body>
<script type="text/javascript">
var yanhua = "yanhua.jb51.net";
var Fire = function (r, color) {
this.radius = r || 12;
this.color = color || "FF6600";
this.xpos = 0;
this.ypos = 0;
this.zpos = 0;
this.vx = 0;
this.vy = 0;
this.vz = 0;
this.mass = 1;
this.p = document.createElement("span");
this.p.className = "jb"+"51Snow";
this.p.innerHTML = "*";
this.p.style.fontSize = this.radius + "px";
this.p.style.color = "#" + this.color;
}
Fire.prototype = {
append: function (parent) {
parent.appendChild(this.p);
},
setSize: function (scale) {
this.p.style.fontSize = this.radius * scale + "px";
},
setPosition: function (x, y) {
this.p.style.left = x + "px";
this.p.style.top = y + "px";
},
setVisible: function (b) {
this.p.style.display = b ? "block" : "none";
}
}
var fireworks = function () {
var fires = new Array();
var count = 100;
var fl = 250;
var vpx = 500;
var vpy = 300;
var gravity = .3;
var floor = 200;
var bounce = -.8;
var timer;
return {
init: function () {
for (var i = 0; i < count; i++) {
var color = 0xFF0000;
color = (Math.random() * 0xFFFFFF).toString(16).toString().split(".")[0];
while (color.length < 6) {
color = "0" + color;
}
var fire = new Fire(12, color);
fires.push(fire);
fire.ypos = -100;
fire.vx = Math.random() * 6 - 3;
fire.vy = Math.random() * 6 - 3;
fire.vz = Math.random() * 6 - 3;
fire.append(document.body);
}
var that = this;
timer = setInterval(function () {
for (var i = 0; i < count; i++) {
that.move(fires[i]);
}
}, 30);
},
move: function (fire) {
fire.vy += gravity;
fire.xpos += fire.vx;
fire.ypos += fire.vy;
fire.zpos += fire.vz;
if (fire.ypos > floor) {
fire.ypos = floor;
fire.vy *= bounce;
}
if (fire.zpos > -fl) {
var scale = fl / (fl + fire.zpos);
fire.setSize(scale);
fire.setPosition(vpx + fire.xpos * scale,
vpy + fire.ypos * scale);
fire.setVisible(true);
} else {
fire.setVisible(false);
}
}
}
}
if (yanhua === &#39;yanhua.jb&#39; + &#39;51.&#39; + &#39;net&#39;)
fireworks().init();
function jb51Snow() {
window.location.reload();
} if (yanhua === &#39;yanhua.jb&#39; + &#39;51.&#39; + &#39;net&#39;)
setInterval(jb51Snow, 6000);
</script>
</body>
</html>

The above is the entire content of this chapter, For more related tutorials, please visit JavaScript Video Tutorial!

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